Carburetor



Feb. 22 1927.

-s. M. UDALE CARBURE'IOR Filed Jan. 12. 1923 2- Sheets-Sheet 1 z mlml'l'll H muru s. M. UDALE Feb. 22 1927.

CARBURETOR 0 a .3; 535: m j R ar mflm z r P B A I N VEN TOR.

Patented Feb. 22, 1927.

UNITED STATES 1,618,244 PATENT OFFICE..

STANLEY M. U.ID ALE, or nnrnorr, MIcHijeAn, AssIe-Ncn r GEORGE M. HOLLEY, or i a nn'rnorr', MICHIGAN.

' cannnnnron.

'. Application med January 12, 1923. Serial No. 612,214. a

elevation in "a plane at right angles to the plane of the throttle, but the levers are shown thereon in elevation. Y v

Figure III shows the same construction in 1 which the novel feature of the invention has been emphasized by exaggeration, namely the eccentric mounting of the throttle E.

In the figures A is the air entrance, B is the restricted mixing chamber, C is the fuel nozzle discharging therein, D is the low speed fuel passage delivering adjacent to and in advance of the throttle valve E. F is the mixtureoutlet preferably .rnadein a conical form, G is the throttle rod, H is the throttle control lever which is'freely mounted on the throttle rod G. J is av bell.

crank lever pinned to the throttle rod G, K is a projecting pin on the throttle lever H which strikes the bell crank lever J and thereby closes the throttle, is a spring con- .necting the pin K with a corresponding pin on the bell crank lever J, whereby as the throttle is closed the tension on the spring L is increased. M is the float chamber, N is the fuel outlet therefrom controlled by a regulable needle 0, P is the fuel well associated with the low andliigh speed outlets C and D, Q is the air vent to the well P. R and S are idling portslocated respectively above and below the closed position of the edge of the throttle valve E, T is the ordinary choke valve or strangling shutter in.

the air entrance which may either be of the fixed or flexible type.

In Figure III all the letters refer to similarly designated parts in Figure II, butthis figure is not intended .to illustrate the referred construction, which is shown in igures I and'II. It-will be clear from an F tplspection of Fi re III that although the rottle shaft is located symmetrically with the conical outlet F it does not divide the throttle E symmetrically. I

0pemtz'on.The operation of this carburetor corresponds to" the normal operation Figure II shows .the transverse sectional of plain tube carburetors so long as the pin K contacts with the bell crank lever J. That is to say as the throttle control 1%"81" H is opened the suction on the throttle E being unbalanced by reason of the fact that the throttle plate E is unequally divided by the throttle rod G, hence the flow of air. from the chamber B to the mixture outlet F tends td open the throttle E. It follows that any movement of the lever H causes a corresponding. movement of the throttle E, providing the depression in the mixture putlet F is sufliciently reat to overcame the tension of the sprin The only time at whlch the operation of this carburetor d'ifi'ers -from that of an ordinary plain tube carburetor is when the "air which causes first a somewhat rich mixture followed immediately. by a lean mixture and the characteristic irregular running ensues.

. By the provision of the spring L and bell crank lever J the opening of the throttle H does not open the throttle directly and immediately, the spring L tending to keep the throttle valve E closed until there is sufficient suction in the manifold to open it. The resultfis that there is not a. premature demand on the nozzle 0 and the lower edge of the throttle valve E remains in the vicinity'of the low speed outlets R and S, thereby improving the operation during the transfer from the low speed fuel nozzle B to the high speed fuel nozzle 0.

The advantages gained, therefore, are

partly due to the fact that the sudden breakin 'of the vacuum above the throttle and subsequent deposition of the fuel and the sweeping in of the fuel by the free flow of atmospheric air is avoided and partly because the transfer from the low and high speed nozzle is made more gradually.

What- I claim is: In a carburetor having an air inlet, a fuel inlet, and a conical mixture outlet; anidling bypass opening into said mixture outlet; an elliptical throttle valve in said mixture out- 110 let, mounted upon a shaft passing through the axis of said conical outlet, but dividing said elliptical valve into two substantially unequal segments; the smaller segment being adjacent the outlet'of said bypass; a twoarmed lever fixed on said throttle shaft; 21 second lever adapted to be manually operated loose upon said shaft; a pin upon said manually operated lever to engage one arm of said two-armed level, to force 10 when the throttle valve is closed by said 15 manually operated lever.

In testimony whereof I affix my signature.

STANLEY M. UDALE. 

